Surface-mountable heat sink



FIG. 1 is a top view of the design for a surface-mountable heat sink;

FIG. 2 is a front elevational view thereof, the opposite rear view being the same;

FIG. 3 is a side elevational view thereof, the opposite side view being the same;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a front, top perspective view thereof. 

CLAIM The ornamental design for a surface-mountable heat sink, as shown and described. 